Renesas Intersil ISL73007SEHDEMO3Z User manual

Demonstration Board Manual
R34UZ0005EU0101 Rev.1.01 Page 1
May 19, 2023 © 2023 Renesas Electronics
The ISL73007SEHDEMO3Z demonstration board
(shown in Figure 3) features the ISL73007SEH buck
regulator. This IC is a small foot print radiation
hardened POL designed for critical low power
applications.
The ISL73007SEH is operational over 3V to 18V
integrating both high-side and low-side power FETs
and switches at a default 500kHz frequency. The
switching frequency can also be programmed from
300kHz up to 1MHz using an external resistor. The
ISL73007SEH uses constant frequency peak current
mode control architecture for fast loop transient
response. The ISL73007SEH can use either its
internal compensation at the 500kHz default
switching frequency or an external Type II
compensation at other frequencies to stabilize the
loop as determined by specific design and
performance requirements. Integrating both P-
channel and N-channel power devices and with the
option of internal compensation, a minimum of
external components are required, thereby reducing
BOM count and complexity of design.
The ISL73007SEHDEMO3Z demonstration board
and this accompanying manual provide a quick and
easy method to evaluate the ISL73007SEH part, see
the ISL73007SEH datasheet for information about the
operation, function, and performance of the device.
Features
▪ Easy to use
▪ Optimized for 12V to 3.3V conversion, externally
set 500kHz switching frequency, external slope and
compensation configuration
▪ 3A Output current
Specifications
The ISL73007SEHDEMO3Z demonstration board is
by default externally configured for immediate
evaluation with minimum components and
connections, which allows for other conditions to be
evaluated with user modification of components and
connections.
The electrical ratings of the ISL73007SEHDEMO3Z
demonstration board are shown in Table 1.
Table 1. Electrical Ratings
Parameter Rating
PVIN Supply Voltage 10.8V - 18V
DC Output Voltage 3.3V
Operating Frequency 500kHz
Output Current 3A
Temperature -55oC to +125oC
Figure 1. Block Diagram
ISL73007SEH VOUT
VIN
ISL73007SEHDEMO3Z

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ISL73007SEHDEMO3Z Demonstration Board Manual
Contents
1. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Operational Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Setup and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Board Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Basic Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Schematic Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.4 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.5 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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ISL73007SEHDEMO3Z Demonstration Board Manual
1. Functional Description
The ISL73007SEHDEMO3Z demonstration board is default configured for 12V to 3.3V conversion with a 3A
maximum output current and contains the ISL73007SEH voltage regulator IC in the external configuration for the
switching frequency, and for control loop and slope compensations. Figure 1 shows the ISL73007SEHDEMO3Z
demonstration board block diagram. Photographs of the ISL73007SEHDEMO3Z are shown in Figure 3 and
Figure 4.
The ISL73007SEHDEMO3Z demonstration board provides access to the pins of the IC device and convenient
pads for connecting test equipment. For more information, see the schematic (Figure 5), PCB layers (Figure 6
through Figure 11), and Bill of Materials. Performance data taken using the ISL73007SEHDEMO3Z and basic lab
equipment is shown in Figure 12 through Figure 19.
1.1 Operational Characteristics
The ISL73007SEHDEMO3Z only requires a single voltage supply >10.8V connected to the PVIN pad to operate,
outputting 3.3V on the VOUT pad with a 3A output current capability. Configured for a nominal PVIN voltage of
12V, the input operating voltage at which the IC turns on is set by the resistor divider (R1 and R2) on the ENABLE
pin. Note: Do not exceed 5V on the ENABLE pin.
1.2 Setup and Configuration
The following equipment is recommended for testing the board.
▪ 12V power supply
▪ 100MHz oscilloscope
Complete the following steps to configure and use the board.
1. Configure the board as shown in Figure 2.
2. Connect and turn on a 12V power supply to the PVIN pad.
3. Using the oscilloscope to look at VIN and VOUT waveforms also observe the behavior of the LX phase node
located on pins 13 and 14 of the IC package. Proper probe grounding must be practiced to observe clean
waveforms.
4. Output current loading can be externally added at the VOUT and GND pads for loaded output evaluations. A
DVM(s) can be employed to monitor input and output voltages and currents.
Figure 2. ISL73007SEH Basic Evaluation Test Setup Block Diagram
PVIN VOUT
ISL73007SEHDEMO3Z
Oscilloscope
GND
+12V
DC Power Supply
-+
GND
LX

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ISL73007SEHDEMO3Z Demonstration Board Manual
2. Board Design
Figure 3. ISL73007SEHDEMO3Z Evaluation Board (Top)
Figure 4. ISL73007SEHDEMO3Z Evaluation Board (Bottom)

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ISL73007SEHDEMO3Z Demonstration Board Manual
2.1 Basic Layout
The ISL73007SEH is located in the center of the board and is labeled U1. Input power is to be connected across
the yellow Tantalum capacitor, the bulk input capacitance (C1) at the PVIN and GND pads. The output voltage
then appears across the V_OUT and GND pads near the output inductor (L1) and the output capacitance (C8),
respectively. Additional CIN is provided by C2 (flip side) and C3. The other passive components near the PVIN pad
are for setting the EN POR, slope compensation, and VCC decoupling. The passive components between the
GND and V_OUT pads on the edge of the PCB are for switching frequency and output voltage setting,
compensating the external loop error amplifier and PGOOD pull-up. Consult the schematic in (Figure 5) for
details.
2.2 Layout Guidelines
PCB design is critical to reduce parasitic inductances with critical components being closely placed to the IC. The
critical components in order would be the loop compensation RC, the slope resistor, and the low ESR ceramic
input capacitors. Avoid placing any traces or components under the LX shapes to avoid noise coupling from the
switching node.
2.3 Schematic Diagrams
Figure 5. Schematic
----- -----
PGND
VOUT
PGND
PVIN
-----
S1
S1
S1
S1
R8
2.21K
P2
C4
1UF
10K
R7
P1
2200PF
C5
22UF
C3
0.1UF
C6
1UF
C7
R3
43K
10K
R2
R5
14.7K
C8
100UF
R1
75K
R6
10K
LX
LX
PG
SGND
COMP
FB
FS
VCC
EN
PVIN
PVIN
PGND
PGND
SLOPE
PAD
U1
ISL73007SEHVF
1
2
3
4
5
6
7 8
9
10
11
12
13
14
15
P4
100UF
C1
4.7UH
L1
P3
22UF
C2
100K
R4
UNNAMED_3_ISL73007SEH_I1_10
UNNAMED_3_ISL73007SEH_I1_12
UNNAMED_3_ISL73007SEH_I1_13
UNNAMED_3_ISL73007SEH_I1_3
UNNAMED_3_ISL73007SEH_I1_5
UNNAMED_3_ISL73007SEH_I1_6
UNNAMED_3_ISL73007SEH_I1_7 UNNAMED_3_ISL73007SEH_I1_8
UNNAMED_3_ISL73007SEH_I1_9
UNNAMED_3_SHIELDEDIND_I11_B
UNNAMED_3_SMCAP_I41_A

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ISL73007SEHDEMO3Z Demonstration Board Manual
2.4 Bill of Materials
Qty
Reference
Designator Description Manufacturer Manufacturer Part
1PWB-PCB,
ISL73007SEHDEMO3Z, REVA,
ROHS
Imagineering Inc ISL73007SEHDEMO3ZREVAPCB
2 C2, C3 CAPACITOR, SMD, 2220, 22µF,
25V, 20%, X7R, ROHS
TDK C5750X7R1E226M
2 C4, C7 CAP-AEC-Q200, SMD, 0603, 1µF,
25V, 10%, X7R, ROHS
Murata GCM188R71E105KA64D
1 C5 CAP, SMD, 0603, 2200pF, 50V,
1%, C0G/NP0, ROHS
Murata GRM1885C1H222FA01D
1 C6 CAP, SMD, 0603, 0.1µF, 25V,
10%, X7R, ROHS
Yageo CC0603KRX7R8BB104
1 C8 CAP-TANT, SMD, 7.3x4.3mm,
100µF, 25V, 20%, 30mΩ at
100MHz, ROHS
Kemet T521X107M025ATE030
1 C1 CAP-TANT, SMD, 7.3x4.3x4.0,
100µF, 20V, 20%, POLYMER
Kemet T541X107M020AH6510
1 L1 COIL-PWR INDUCT, SMD,
5.4x5.2mm, 4.7µH.20%, 7.4A,
19.6mohm, ROHS
Coilcraft XEL5050-472MEC
1 U1 IC-RAD LIGHT 3A POL
REGULATOR, 14P, CFP, ROHS
Renesas Electronics ISL73007SEHF/PROTO
1 R3 RES, SMD, 0603, 43k, 1/10W, 0.1%,
TF, ROHS
Panasonic ERA-3AEB433V
3 R2, R6, R7 RES, SMD, 0603, 10k, 1/10W, 1%,
TF, ROHS
Venkel CR0603-10W-1002FT
1 R4 RES, SMD, 0603, 100k, 1/10W, 1%,
TF, ROHS
Venkel CR0603-10W-1003FT
1 R5 RES, SMD, 0603, 14.7k, 1/10W, 1%,
TF, ROHS
Venkel CR0603-10W-1472FT
1 R8 RES, SMD, 0603, 2.21k, 1/10W, 1%,
TF, ROHS
Yageo RC0603FR-072K21L
1 R1 RES, SMD, 0603, 75k, 1/10W, 1%,
TF, ROHS
Venkel CR0603-10W-7502FT
0 P1, P2, P3, P4 DO NOT POPULATE OR
PURCHASE

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ISL73007SEHDEMO3Z Demonstration Board Manual
2.5 Board Layout
Figure 6. Top Layer Figure 7. Layer 2
Figure 8. Layer 3 Figure 9. Bottom Layer
Figure 10. Top Silk Layer Figure 11. Bottom Silk Layer

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ISL73007SEHDEMO3Z Demonstration Board Manual
3. Typical Performance Graphs
Unless otherwise noted, PVIN = 12V; VOUT = 3.3V, fSW = 500kHz, TA = Room Ambient
Figure 12. Efficiency Figure 13. Load Regulation
Figure 14. Turn-on /off, 1Ω load Figure 15. Shorted Output into Restart through Hiccup
Figure 16. +2.8A Output Current Transient Figure 17. -2.8A Output Current Transient
0
10
20
30
40
50
60
70
80
90
100
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
Efficiency (%)
Output Current (A)
-0.10
-0.08
-0.06
-0.04
-0.02
0.00
0.02
0.04
0.06
0.08
0.10
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0
Load Regulation (%)
Output Current (A)
VIN
LXV
VOUT
IOUT
IIN
VOUT
IOUT
VOUT
LXV
IOUT
VOUT
LXV

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ISL73007SEHDEMO3Z Demonstration Board Manual
4. Ordering Information
5. Revision History
Figure 18. Gain/Phase BODE Plot, IOUT = 1.3A Figure 19. Package Temperature at IOUT = 3A
Part Number Description
ISL73007SEHDEMO3Z Radiation Hardened ISL73007SEH buck regulator demonstration board
Revision Date Description
1.01 May 19, 2023 Updated Figure 3.
1.00 Mar 16, 2022 Initial release
Unless otherwise noted, PVIN = 12V; VOUT = 3.3V, fSW = 500kHz, TA = Room Ambient (Cont.)
-200
-150
-100
-50
0
50
100
150
200
-80
-60
-40
-20
0
20
40
60
80
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06
Phase Margin (o)
Gain (dB)
Frequency (Hz)
Gain (dB) 1.3A
Phase (Deg) 1.3A

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